Vacuum insulated flask



1.1 is a perspective view of a vacuum insulated flask showing my new design;

1.2 is a front view thereof;

1.3 is a left side view thereof;

1.4 is a rear view thereof;

1.5 is a right side view thereof;

1.6 is a top plan view thereof;

1.7 is a bottom plan view thereof; and

1.8 is another perspective view thereof.

The broken lines showing portions of the article form no part of the claimed design. 

CLAIM The ornamental design for a vacuum insulated flask, as shown and described. 